Hey Jude (sorry, couldn't resist it) you poor thing. I remember it well. It is horrible when things start to change but unfortunately it is the change of life. You can try damage limitation and be mindful of your health and diet and activity levels but I found that there was no completely halting the process.
It took me five years of mumbling and grumbling and moaning and feeling sorry for myself and making everyone else miserable until this year when I gave myself a talking to and realised that I hadn't managed to halt the passage of time and that time was definitely in the driving seat.
I have come to the conclusion that I need to embrace the change and accept the 58 year old rounder, older me and maybe adjust my lifestlye accordingly but I did not come to that point easily.
All I can say is that it is much easier with this group to let of steam and bounce ideas and thoughts to, the ladies are so helpful and supportive.
Welcome to the forum.